EP3722039A1 - Procédé et arrangement de soudage à synchronisation de valeur mesurée - Google Patents

Procédé et arrangement de soudage à synchronisation de valeur mesurée Download PDF

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Publication number
EP3722039A1
EP3722039A1 EP19168536.1A EP19168536A EP3722039A1 EP 3722039 A1 EP3722039 A1 EP 3722039A1 EP 19168536 A EP19168536 A EP 19168536A EP 3722039 A1 EP3722039 A1 EP 3722039A1
Authority
EP
European Patent Office
Prior art keywords
welding
current
measured variable
german
synchronization information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19168536.1A
Other languages
German (de)
English (en)
Inventor
Dominik SÖLLINGER
Manuel Mayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fronius International GmbH
Original Assignee
Fronius International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fronius International GmbH filed Critical Fronius International GmbH
Priority to EP19168536.1A priority Critical patent/EP3722039A1/fr
Priority to EP20716819.6A priority patent/EP3953094B1/fr
Priority to JP2021559737A priority patent/JP7300000B2/ja
Priority to FIEP20716819.6T priority patent/FI3953094T3/fi
Priority to PCT/EP2020/060166 priority patent/WO2020208144A1/fr
Priority to US17/602,387 priority patent/US20220161348A1/en
Priority to CN202080027587.9A priority patent/CN113677472B/zh
Publication of EP3722039A1 publication Critical patent/EP3722039A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • B23K9/1006—Power supply
    • B23K9/1012—Power supply characterised by parts of the process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/02—Carriages for supporting the welding or cutting element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/007—Spot arc welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/095—Monitoring or automatic control of welding parameters
    • B23K9/0956—Monitoring or automatic control of welding parameters using sensing means, e.g. optical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • B23K9/1006—Power supply
    • B23K9/1075—Parallel power supply, i.e. multiple power supplies or multiple inverters supplying a single arc or welding current

Definitions

  • the invention relates to a welding method in which a welding process is carried out with at least one welding device, the at least one welding device detecting an electrical measured variable in a welding current circuit for controlling the welding process of the welding device.
  • the invention further relates to a welding arrangement with at least one welding device for carrying out a welding process, the at least one welding device being provided to detect an electrical measured variable in its welding circuit for controlling the welding process.
  • welding is often done in close proximity to one or more other electrical devices.
  • a further welding device could be provided as the electrical device, so that welding is carried out in parallel with several mutually independent welding devices, for example in order to increase the welding performance.
  • the multiple welding devices and / or other electrical devices can be arranged directly next to one another or in close proximity to one another, for example in a common space such as e.g. a welding cell.
  • a welding robot for guiding a welding torch, a spot welding device, etc. is often also arranged in the vicinity of the welding device.
  • Each welding device generally has its own welding power source as well as a ground line and a welding torch with a welding electrode, which during operation form a welding current circuit over an (electrically conductive) workpiece.
  • a common ground line is often used, for example a so-called busbar, which serves as a common electrical potential.
  • Other electrical devices such as a welding robot, in turn each have their own device circuit.
  • a device circuit could be provided for several drive motors of the available axes of the welding robot, or there could be one device circuit for other electrical devices, e.g. a spot welding gun of a spot welding device can be provided.
  • an arc is ignited in a known manner with each welding device between the electrode of the welding torch and the workpiece.
  • the arc partially melts the workpiece, creating a so-called melt pool.
  • the arc melts an additive supplied to the weld pool, which can either be the electrode itself (MIG / MAG) or a separately supplied additive (TIG).
  • a so-called protective gas is also used to shield the weld pool from the ambient air.
  • a common hose package is provided in which the consumable electrode material e.g. is fed to the welding torch in the form of a welding wire together with a protective gas line.
  • Further lines can also be provided in the hose package, for example a supply and return line for a cooling medium for the welding torch, or control lines.
  • specific welding parameters are generally set on the respective welding device, for example by a suitable control unit of the welding device and / or by a user.
  • Such welding parameters are e.g. a welding voltage, a welding current and a welding wire feed speed of the consumable electrode (MIG / MAG) or the additive (TIG), whereby different welding parameters can be set for different welding processes.
  • the welding device also records an electrical measured variable while the welding process is being carried out, for example the welding voltage, the welding current, or an electrical resistance of the welding circuit.
  • the recorded measured variable is processed by the welding device in order to monitor, control or regulate the welding process.
  • Known welding processes that are carried out with a welding device are, for example, a pulse welding process, a short arc welding process or a short arc welding process with a reversing wire electrode (e.g. a so-called cold metal transfer welding process). Spray arc welding process, mixed processes, welding process with rotating arc, etc. there.
  • a defined cyclical change in the welding current can take place in the respective welding current circuit, which leads to a droplet detachment from the melting electrode or the additive.
  • the welding devices are positioned in space relative to one another in such a way that their welding circuits partially cross and / or partially run parallel (which of course refers to the electrical lines of the welding circuits). It can also happen that the welding circuit of one welding machine crosses with the circuit of another electrical device or runs parallel to it, for example the device circuit of a welding robot.
  • the ground lines of individual welding devices arranged next to one another can, for practical reasons, be laid essentially parallel between the welding devices and a welding workstation.
  • the hose packages that lead to the welding torches can sometimes also cross, for example when welding on several sides of a workpiece, or they can be run parallel. Despite the electrical insulation of the current-carrying lines, this can lead to the welding circuits of the welding devices influencing each other electromagnetically.
  • the welding current changes, for example, in periodically repeated welding cycles between a basic current and a pulse current, it being possible for steep current rising edges and current falling edges to be provided.
  • the time-varying welding current in a first welding current circuit generates a time-varying magnetic field around the welding current lead to the welding torch, but also via the return ground lead. This magnetic field can in turn induce an electrical voltage in a second (or more) welding circuit, in particular if the second welding circuit is arranged in the vicinity of the first welding circuit.
  • This induced voltage can lead to the measured variable detected in the second welding circuit, in particular a welding voltage, being detected incorrectly because the inductive coupling can cause voltage peaks that influence the measurement.
  • a falsified value can be measured due to the induced voltage.
  • the incorrect measured value can then have a disadvantageous effect on the regulation or control of the respective welding process, in particular this can lead to an unstable welding process. If two (or more) welding processes are carried out simultaneously, each with pulse-shaped welding currents, the two (or more) welding processes can also interfere with one another and influence the measurement.
  • the object of the invention is to ensure a more stable welding process for a welding method in which at least one welding device is used for welding.
  • the object is achieved according to the invention in that during the welding process carried out with the welding device, synchronization information is sent to the at least one welding device by at least one other electrical device in which a device current flows at least at one point in time in a device circuit and that the at least one welding device uses the synchronization information obtained to ignore the measured values of the measured variable recorded at the point in time.
  • the synchronization information preferably contains information about a temporal device current change in the device circuit that influences the measured variable of the welding device, and the welding device uses the synchronization information to ignore the measured values of the measured variable recorded during the device current change that influenced the measured variable. This ensures that the measured variable that is used to control the welding process is not negatively influenced by another electrical device, which creates a more stable welding process, whereby ignoring the measured values naturally also means an interruption of the measured value acquisition.
  • An electrical component of a welding system in particular a spot welding device or a welding robot, is preferably used as the electrical device.
  • a spot welding device or a welding robot is preferably used as the electrical device.
  • the electrical device used is a welding device that carries out a welding process with a welding current that changes over time
  • the welding device that carries out the welding process with the welding current that changes over time displays synchronization information about a change in the welding current of the welding process that affects the measured variable of the other welding device
  • the welding device sends that records the measured variable and that the welding device that records the measured variable uses the synchronization information received in order to ignore the measured values of the measured variable recorded during the change in the welding current that affects the measured variable.
  • At least two welding devices each perform a welding process with a welding current that varies over time, with each of the at least two welding devices recording a measured variable in its welding current circuit, the welding devices alternately providing synchronization information about the change in welding current of the welding process carried out, which influences the measured variable of the other welding device and the welding devices use the synchronization information received from the other welding device in order to ignore the measured values of the measured variable recorded during the welding current changes.
  • a pulse welding process, a short arc welding process, a spray arc welding process or a welding process with reversing welding wire feed is preferably used as the welding process with a welding current that changes over time. This allows the method to be used in the most common welding processes.
  • the synchronization information sent advantageously contains temporal information about a start and an end of the device current change and / or welding current change, with the measured values recorded by the welding device receiving the synchronization information between the start and the end of the device current change and / or welding current change Measured variable can be ignored. This creates a simple way of providing synchronization information.
  • the synchronization information is sent a certain lead time before the device current change and / or the welding current change.
  • the synchronization information can be sent at an early stage in the case of known current profiles, whereby e.g. any delays in data transmission can be compensated.
  • a welding voltage and / or a welding current and / or an electrical welding resistance is advantageously recorded as the measured variable, since these electrical variables are common measured values for regulating a welding process.
  • At least one welding device transmits the recorded measured variable to an external device for further use and that the external device uses the recorded measured variable to control a process of the external device or to analyze the welding process of the welding device, with the external device a welding robot is preferably provided that guides a welding torch of the welding device, to generate a weld seam and the welding robot uses the measured variable obtained to control a movement of the welding torch.
  • the correctly recorded measured variable can be used for other purposes.
  • a welding arrangement 1 with two mutually independent welding devices A, B is shown in simplified form as an example.
  • the welding devices A, B are designed here as MIG / MAG welding devices with a consumable electrode, but one or more TIG welding devices with a non-consumable electrode or a laser hybrid welding device could of course also be used.
  • a welding process is carried out simultaneously on a common workpiece 6 with both welding devices A, B.
  • more than the two welding devices A, B shown could also be provided.
  • only one welding device B could be provided, and instead of the second welding device A, another electrical device EG, such as an electrical component of a welding system, for example a welding robot, could be provided.
  • each welding device A, B forms its own welding circuit for carrying out a welding process.
  • the welding devices A, B each have a welding power source 2a, 2b, a welding wire feed unit (not shown) and a welding torch 4a, 4b (MIG / MAG welding devices).
  • the welding wire feed unit can of course be omitted.
  • the welding power sources 2a, 2b each provide the required welding voltage UA, UB, which is applied to a welding wire 3a, 3b as a consumable electrode (or to a non-consumable electrode in the case of a welding process with a consumable electrode such as TIG welding).
  • the welding wire 3a, 3b is attached to the respective welding torch 4a, 4b supplied by means of the welding wire feed unit at a certain welding wire feed speed.
  • the supply can take place, for example, within a hose package 5a, 5b or also outside of it.
  • the welding wire feed unit can each be integrated in the welding device A, B, but can also be a separate unit.
  • an arc is ignited between the welding wire 3 a, 3 b and the workpiece 6.
  • the material of the workpiece 6 is locally melted by the arc and a so-called melt pool is generated.
  • the welding wire 3 a, 3 b is fed to the weld pool by means of a certain welding wire feed speed and is melted off by the arc in order to apply material of the welding additive to the workpiece 6.
  • a weld seam can thereby be formed.
  • further lines can optionally also be provided between the welding device A, B and the respective welding torch 4a, 4b (for example a control line or a coolant line).
  • a protective gas is also often used to shield the weld pool from the ambient air, in particular the oxygen it contains, in order to avoid oxidation.
  • Inert gases e.g. argon
  • active gases e.g. CO2
  • the protective gases are usually stored in separate (pressure) containers 7a, 7b, which e.g. can be fed to the welding devices A, B (or directly to the welding torch 4a, 4b) via suitable lines.
  • hose package 5a, 5b can be connected to the welding torch 4a, 4b and to the welding device A, B e.g. be coupled via suitable couplings.
  • the welding current sources 2a, 2b in the example shown are each connected to the workpiece 6 with a ground line 8a, 8b.
  • One pole of the welding power source 2a, 2b usually the positive pole, is connected to the ground line 8a, 8b, the other pole of the welding power source 2a, 2b, usually the negative pole, is connected to the welding electrode (or vice versa).
  • a welding current circuit is thus formed for each welding process via the arc and the workpiece 6.
  • welding devices A, B could also be used to weld on their own workpiece 6.
  • the corresponding ground line 8a, 8b must then of course be connected to the respective workpiece 6.
  • Fig.1 In the example shown in Fig.1 are the two ground lines 8a, 8b over a large one Area D laid parallel to each other essentially next to each other. This proximity of the electrical ground lines 8a, 8b to one another can, in spite of electrically non-conductive insulation, lead to the ground lines 8a, 8b influencing one another electromagnetically, as mentioned at the beginning.
  • the electromagnetic coupling is indicated schematically by magnetic circles K.
  • the welding current lines to the welding torches 4a, 4b can partially cross or run in parallel, which can also lead to an electromagnetic coupling.
  • an electromagnetic coupling can result between the ground line 8b of the welding device B and an electrical connection line of the electrical device EG, for example if the ground line 8b and the electrical connection line of the electrical device EG cross or in the immediate vicinity are to each other.
  • a common ground line 8c could also be used, as in FIG Fig.1 is indicated by dash-dotted lines.
  • a busbar can advantageously be used as a common electrical potential for several electrical devices.
  • further electrical devices EGX could also be connected to the busbar 8c, for example a welding robot, in particular its electrical drives.
  • a commonly used ground line 8c thus forms an ohmic resistance in a simplified manner.
  • a voltage induced in the other ground line 8a, 8b can lead to an unstable welding process due to incorrect measured variables, in particular when measuring the welding voltage UA, UB, as will be explained in detail below.
  • another electrical device EG is provided (or in addition)
  • Such time-variable device currents IEG are to be understood in particular as those current changes which, for example, change the welding voltage UB as an electrical measured variable in the range of 0.5-20V, in particular between 3-8V.
  • welding processes with a welding current that changes over time are to be understood as meaning, in particular, those welding processes in which welding cycles with welding currents I of different levels alternate periodically, the welding current change being sufficiently large and occurring sufficiently quickly to allow for a To induce voltage in an adjacent welding circuit in order to influence the recording of measured values.
  • the welding currents I vary in the range between 3A-1500A, in particular between 20A-750A.
  • Typical changes in current over time are, for example, in the range between 10-5000 A / ms, preferably 100-2000 A / ms, in particular 300-1500 A / ms.
  • a control unit 9a, 9b is also provided in each of the welding devices A, B, which controls and monitors the respective welding process.
  • the welding parameters required for the welding process such as the welding wire feed speed, the welding current IA, IB, the welding voltage UA, UB, the pulse frequency, the pulse current duration, etc. are specified or adjustable in the control unit 9a, 9b.
  • the control unit 9a, 9b is connected to the welding power source 2a, 2b.
  • a user interface 10a, 10b connected to the control unit 9a, 9b can also be provided for entering or displaying certain welding parameters or a welding status.
  • the welding devices A, B described are of course well known, which is why they will not be discussed in more detail at this point.
  • the two welding torches 4a, 4b can also be arranged locally relative to one another in such a way that these welding wires 3a, 3b work in a common weld pool on the workpiece 6, instead of in two separate weld pools, as in FIG Fig.1 shown.
  • This arrangement with respect to one another can be fixed, for example in that both welding torches 4a, 4b are arranged on a welding robot (not shown) which guides both welding torches 4a, 4b.
  • the arrangement can also be variable, for example in that one welding torch 4a, 4b is guided by a welding robot.
  • a common welding torch could also be provided for both welding wires 3a, 3b. It is irrelevant whether the welding torches 4a, 4b are used for joint welding or surfacing, or some other welding process.
  • At least one welding device (here the welding device B) is provided in the welding arrangement 1, with which a welding process is carried out.
  • the at least one welding device here the welding device B, detects an electrical measured variable in its welding circuit to control its welding process.
  • a welding voltage UB usually based on the ground potential
  • a welding current IB in the welding circuit and / or an electrical welding resistor can be used.
  • a welding wire feed speed is also used, but this is not influenced by an induced voltage or a voltage drop.
  • the measured variable can be recorded, for example, by the welding current source 2b or by the control unit 9b of the corresponding welding device B, or also by a separate measuring device (not shown).
  • a device current IEG that changes over time flows at least at one point in time, the second welding device A being provided as the electrical device EG in the present example.
  • a welding robot (not shown) can also be provided as an electrical device EG, in whose device circuit a device current IEG which is variable over time flows at least at one point in time.
  • the device current of a drive motor of a welding robot could change as a function of a specific movement sequence or operating state of the welding robot in such a way that the measured variable recorded by welding device B is influenced.
  • the welding device A (as an electrical device EG) is provided to carry out a welding process with a welding current IA that varies over time, for example a pulse welding process, as shown below with reference to Fig. 2 will be explained in more detail.
  • both welding devices A, B can each carry out a welding process with a welding current IA, IB that changes over time and both welding devices A, B can each record a measured variable to control the respective welding process, e.g. a welding voltage UA, UB each.
  • the welding devices A, B are connected by means of a communication link 11 via which synchronization information Y can be exchanged between the welding devices A, B, preferably alternately.
  • the communication connection 11 can be, for example, a wired or wireless connection between the control units 9a, 9b or between the user interfaces 10a, 10b. If, instead of the welding device A, another electrical device EG is provided (or an additional one), then this other electrical device EG is connected to the welding device B by means of the communication link 11.
  • the communication link 11 could be provided between the control unit 9b of the welding device B and a control unit of a welding robot.
  • the welding device A (which carries out the welding process with the welding current IA, which changes over time - see Fig. 2 ) or generally the electrical device EG sends synchronization information Y via the communication link 11 to the Welding device B (the welding device that records the measured variable).
  • the welding device A, or the control unit 9a usually has knowledge of the welding process carried out and of the time profile of the welding current IA or the welding voltage UA and thus knows when the welding current IA or the welding voltage UA changes.
  • the welding device B processes the synchronization information Y received in order to ignore the measured values of the measured variable recorded at the time of the variable device current IEG (here the welding current IA).
  • the synchronization information Y preferably contains information about a temporal device current change in the device circuit of the electrical device EG (here of the welding device A), which influences the measured variable of the welding device B, and the welding device B (which records the measured variable) uses the synchronization information Y, in order to ignore the measured values of the measured variable recorded during the device current change influencing the measured variable, as will be explained in detail below.
  • ignoring can mean that although a continuous measurement is carried out by welding device B, the measured values recorded during the temporal device current change are not used to control the welding process. Ignoring can also mean, however, that the measurement value acquisition by the welding device B is interrupted during the temporal device current change in the device circuit, i.e. no measured values are generated at all during this period. In this way, periods of time with possible voltage or current peaks cannot be taken into account during the measurement and consequently incorrect measurements can be avoided. If, instead of the welding device A, another electrical device EG is used, for example a welding robot, it may be that the future course of the device current IEG is not known.
  • a threshold value for the device current IEG and / or for the device current change could be stored in a control unit of the electrical device EG and the synchronization information Y is sent to the welding device B when the threshold value is reached or exceeded when the current increases or if there is a power drop.
  • the synchronization information Y is a synchronization pulse P which is sent from the sending welding device A (or generally the electrical device EG) to the receiving welding device B via the communication link 11.
  • the synchronization pulse P can, for example, be sent as a current or voltage pulse on a wired communication link 11 between the two welding devices A, B.
  • the communication link 11 could, for example, also be designed as a data bus on which bus messages are sent.
  • the synchronization pulse P can be sent as a bus message, which can be done both wired (cable, glass fiber, etc.) and wirelessly (wifi, bluetooth, etc.).
  • a diagram is shown with the curves of the welding currents IA, IB of the two welding processes carried out simultaneously with the welding devices A, B over time t.
  • an electrical device EG could generally also be provided, in the device circuit of which a device current IEG that changes over time flows at least at one point in time, in particular a device current IEG that influences the measured variable recorded by the welding device B.
  • the solid line represents the course of the welding current IA of the welding process of the welding device A, the dashed line the course of the welding current IB of the welding process of the welding device B.
  • the middle diagram shows a course of synchronization information Y over the time t, which is transmitted via the communication link 11 is transmitted from welding device A to welding device B.
  • the synchronization information Y is processed by the welding device B in order to ignore the recorded measured values of the measured variable at the time of the at least one temporal device current change, here during the welding current change in the welding process of the welding device A.
  • the acquisition of the welding voltage UB as a measured variable of the welding device B is plotted over the time t.
  • a welding process with a welding current IA, IB that changes over time is carried out with both welding devices A, B, here in particular a pulse welding process.
  • Welding device A carries out a welding process with a welding current IA that changes over time, which influences the measured variable of the other welding device, here welding device B, or that a time-variable current IEG flows in the device circuit of another electrical device EG, which influences the measured variable of welding device B.
  • it is not necessary to use two identical welding processes e.g. two MIG / MAG welding processes), but two (or more) different welding processes can be carried out.
  • a basic current IG and a pulse current IP which is increased in comparison, alternate periodically with a predetermined pulse frequency f, as in FIG Fig. 2 can be seen.
  • the pulse frequency f results as the reciprocal of the period tS of a welding cycle S consisting of a pulse current phase PP with the pulse current IP and a basic current phase PG with the basic current IG.
  • a drop of sweat is released into the weld pool during the pulsed current phase PP.
  • the pulse frequency f and / or the value of the basic current IG or pulse current IP can also change during a weld.
  • the time profiles of the welding currents IG, IP are in Fig. 2 naturally idealized and simplified. Often times Short intermediate current pulses (not shown) are provided in the basic current phase PG in order to increase the process stability. However, this does not change anything about the period tS of a welding cycle S and the resulting pulse frequency f.
  • the welding wire feed speed, the welding currents, the base current and pulse current durations and the pulse frequency f are preferably coordinated so that a drop is generated and detached with each current pulse.
  • Welding wire feed speed and pulse frequency f are generally dependent on one another.
  • the courses could of course also differ, in particular different pulse frequencies fA, fB, welding currents or pulse durations can be provided.
  • a different phase shift, of course also no phase shift, can of course also be provided.
  • the two pulse welding processes are advantageously synchronized with one another.
  • exemplary synchronization information Y is shown over time t, time t being synchronous with time t in the upper diagram.
  • the welding device A or the control unit 9a, monitors the course of the welding current IA for changes in the welding current over time dI A. German ascertain.
  • the control unit 9a shows a specific (for example by welding parameters) predetermined or adjustable welding current changes dI A. German establishes, synchronization information Y is transmitted to welding device B via communication link 11 (see FIG Fig.1 ).
  • the future course of the welding current IA over time can be known to the control unit 9a, for example on the basis of predetermined welding parameters of a welding program.
  • the control unit 9a is thus aware of future occurrences Welding current changes dI A. German and can send corresponding synchronization information Y to the control unit 9b of the welding device B. Establishing can also mean, however, that the future course of the welding current IA (or, in general, the device current IEG of an electrical device EG) is not known and the control unit 9a is not aware of the changes in the welding current dI A. German automatically detected from the time profile of the welding current IA, for example on the basis of predetermined or adjustable threshold values.
  • a control unit of the electrical device EG transmits synchronization information Y to the welding device B via the communication link 11. For example, each current edge limiting the pulse current phase PP can be recognized.
  • the control unit 9b of the welding device B processes this synchronization information Y obtained during the changes in the welding current dI A.
  • German to ignore the measured values of the measured variable recorded in the welding process of the welding device A, as indicated in the lower diagram based on the welding voltage UB as the measured variable. This can ensure that incorrectly recorded measured values of the measured variable during the welding current changes dI A. German cannot be used to control or regulate the welding process performed with welding device B. This means that a continuous measurement of the measured variable is carried out, but those measured values that are falsified due to the electromagnetic or ohmic coupling are hidden or ignored. Of course, instead of ignoring the wrong measured values, it would also be possible to record the measured variable during the welding current changes dI A. German is interrupted so that during the welding current changes dI A. German no measured values are generated.
  • the transmitted synchronization information Y preferably contains temporal information about a beginning and an end of the respective welding current change dI A. German and the welding device B, which receives the synchronization information Y, ignores that in the period between the start and the end of the welding current change dI A. German recorded measured values of the measured variable (or the measurement is interrupted).
  • tAx, tEx are transmitted as synchronization information Y to welding device B and control unit 9b processes these in order to ignore the measured values of the measured variable recorded during a time period ⁇ t1 between time tA1, tE1 and during a time period ⁇ t2 between time tA2, tE2 or to interrupt the measurement of the measured variable, as indicated by the hatched areas in the diagram below .
  • the welding voltage UB of the welding device B is plotted as a measured variable over time t, with time t being synchronous with the diagrams above. It can be seen that the control unit 9b (or a corresponding measuring device) receives the measured values of the measured variable during the welding current change dI A. German of the welding process of welding device A is ignored or the acquisition of the measured variable, here the welding voltage UB, is interrupted.
  • the beginning and the end of the current flanks of the welding current IA are transmitted as synchronization information Y from welding device A to welding device B and welding device B or control unit 9b ignores the recorded measured values during Time span ⁇ t1 between time tA1, tE1 and during the time span ⁇ t2 between time tA2, tE2 (and all further changes in welding current dI A. German ). This ensures that the welding current changes dI A.
  • German of the welding process of welding device A does not adversely affect the welding process of welding device B, the measured values that are not used to control or regulate the welding process of the welding device B during the time in which a voltage interfering with the measurement can be induced in the welding circuit of welding device B (hatched areas) Welding machine B can be used.
  • the acquisition of the measured variable, in particular the welding voltage UB could of course be suspended.
  • the disturbance of the measured variable due to an irregular welding voltage UB during the welding current changes dI A.
  • German of the welding process of the welding device A indicated by way of example (hatched areas).
  • reality can also result in other courses, for example an overshoot of the measured value at the beginning of a pulse current phase PP.
  • both current flanks (current rise, current fall) of a pulse current phase PP of the welding process of welding machine A are not critical with regard to a voltage induction in the welding circuit of welding machine B or generally in the other respective welding circuit (s) (e.g. because the duration and / or level of the Welding current change induces only a negligible voltage or, in the case of a common ground line 8c, generates a negligible voltage drop), it could of course also be sufficient if the measured values recorded by welding device B only occur during the relevant welding current change dI A. German of the welding process of welding machine A can be ignored or the recording of measured values is interrupted and not with every change in the welding current dI A. German . Whether a change in welding current dI A. German is relevant, for example, on the duration and / or the level of the respective welding current change dI A. German be dependent and be stored, for example, as a threshold value in the control unit 9a.
  • the actual time information does not necessarily have to be transmitted as synchronization information Y, but it could also be sufficient to use only a synchronization pulse P (current or voltage) as synchronization information Y for a start / end of the at least one time change in the device current IEG, in particular a change in welding current dI A. German to submit.
  • the control unit 9b then ignores the recorded measured values of the measured variable or starts using the measured values (here the welding voltage UB) when it receives a synchronization pulse P.
  • synchronization pulses P are continuously sent from welding device A to welding device B and welding device B uses the measured values or records the Measured variable only continues again when it no longer receives any synchronization pulses P. If a data bus is provided as the data communication link 11, instead of synchronization pulses P, corresponding bus messages can be sent and received.
  • both Welding devices A, B each determine synchronization information YA, YB and exchange it via the communication link 11.
  • the welding device A can read the measured values of the measured variable during changes in the welding current dI B. German ignore in the welding process of welding machine B or interrupt the measurement and vice versa.
  • the welding circuits of which have an electromagnetic or ohmic coupling advantageously all welding devices A, B, ... n involved exchange mutual synchronization information YA, YB, Yn.
  • the method according to the invention can preferably be activated and deactivated by a user, for example via the user interfaces 10a, 10b, and / or certain parameters can be set. It would be conceivable, for example, that a certain threshold value for a welding current change dI German is specified and synchronization information Y is only determined or sent when this value is reached or exceeded and / or that a threshold value for the time period ⁇ t can be set and synchronization information Y is only determined or sent when this value is reached or exceeded. In this way, under certain circumstances, the ignoring of measured values or the interruption of the acquisition of the measured variable can be omitted if the threshold values are not reached. For example, a duration and / or a level (eg difference between pulse current IP and base current IG) could be specified as the threshold value.
  • a duration and / or a level eg difference between pulse current IP and base current IG
  • the synchronization information Y is a certain lead time tv before the corresponding change in welding current dI German is sent to the other / other welding device / s, for example to compensate for delays in data transmission.
  • the welding parameters e.g. pulse frequency f, period tS, duration of a pulse current phase PP, duration of a basic current phase PG, etc.
  • the times and periods of future welding current changes are also known dI i German known. It is thus possible to have the synchronization information Y a lead time tv before the actual welding current changes dI German to be sent to the respective other welding machine.
  • German here for example time tA1 as synchronization information Y (for example as a synchronization pulse P at time tA1) is transmitted to the welding device B and the relevant welding parameters of the welding process carried out with the welding device A are also transmitted to the welding device B.
  • the control unit 9b of the welding device B can then use them to determine the points in time and time periods of all future changes in welding current dI A.
  • German determine in the welding process of welding device A and take into account accordingly in order to interrupt the acquisition of the measured variable.
  • the synchronization information Y from the control unit 9a can also only be sent immediately when a change in the welding current occurs dI A. German which is recognized by the control unit 9a. This can be the case, for example, with dynamic arc length regulation, in which the welding parameters can change in order to regulate a specific target arc length.
  • the welding method according to the invention is particularly advantageous when a welding voltage U (here UB) is used as the measured variable (here of the welding device B). Since the welding current change dI A. German If a voltage is induced in the welding circuit of welding device B in the welding process of welding device A due to the electromagnetic coupling of the welding circuits, this induced voltage has a direct effect on the measured welding voltage UB. The same applies to an ohmic coupling of both welding circuits, in which the voltage drop due to the change in welding current dI A. German in the welding process of welding device A affects the common electrical potential of the two welding circuits and thus directly on the measured welding voltage UB of welding device B, as will be explained in more detail below.
  • the welding voltage UB which is usually continuously measured, can be falsified under certain circumstances, which can lead to an unstable welding process on welding device B.
  • the recorded measured values of the welding voltage UB are ignored during the voltage induction or during the voltage drop, or the recording of the welding voltage UB is omitted and only then are the measured values used again or the measurement continued.
  • a Welding current I and / or an electrical welding resistance can be detected and used to control the respective welding process.
  • a common ground line 8c such as a busbar
  • the welding circuits of welding devices A, B (or the welding circuit of welding device B and the device circuit of another electrical device EG) do not influence each other electromagnetically. This takes place when the device current changes dI EG German in the device circuit of the electrical device EG (in the example shown, when the welding current changes dI A. German in the welding circuit of welding machine A) no voltage induction in the welding circuit of welding machine B (which records the measured value). This means that there is no disadvantageous influence on the recording of measured values due to voltage induction.
  • the common ground line 8c forms, in a simplified manner, an ohmic resistance for the welding circuits or the device circuit (s).
  • a welding current IA (or device current IEG) flows in the welding circuit of the welding device A (or generally in the device circuit of the electrical device EG)
  • the welding device B now detects, for example, a welding voltage UB in its welding circuit as a measured variable, this can lead to an incorrect measurement result due to the change in potential caused in another (welding) circuit, similar to the electromagnetic coupling. It is therefore advantageous if the welding device B in the ohmic coupling in a manner analogous to the electromagnetic coupling, the recorded measured values of the measured variable during a welding current change dI A. German in the welding circuit of welding machine A (or generally during a machine current change dI EG German in the device circuit of the electrical device EG) is ignored or the acquisition of the measured variable is interrupted.
  • the voltage drop in the ohmic coupling does not depend on the welding current changes over time dI A. German depends, but essentially on the absolute value of the welding current IA or generally the device current IEG. The difference between the base current IGA and the pulse current IPA is therefore essential for the voltage drop.
  • the measured variable detected by the welding device B is transmitted to an external device for further use.
  • a welding robot can be provided as an external device, which guides the welding torch 4b of the welding device B in a certain predetermined sequence of movements in order to produce a weld seam.
  • the welding robot can, for example, use the measured variable recorded by the welding device B to control the movement of the welding torch 4b of the welding device B.
  • a weld seam tracking process can be implemented in a control unit of the welding robot, for example from the EP 1 268 110 B2 is known.
  • the control unit of the welding robot uses, for example, the conventionally measured welding voltage UB of the welding device B (without the inventive interruption of the measured value acquisition or ignoring the measured values) as the input variable for the control for welding seam tracking, this can possibly be falsified (by electromagnetic or ohmic coupling) welding voltage UB under Certain circumstances lead to undesirable deviations in the weld seam tracking.
  • the suppressed measured variable e.g. welding voltage UB
  • the control unit of the welding robot uses the suppressed measured variable to control / regulate the welding seam tracking, as this may result in incorrect measured values, e.g. during the welding current changes dI A. German no longer contains in the welding circuit of welding machine A. Under the suppressed measured variable is the recorded measured variable without the measured values during the relevant welding current changes dI A. German to understand.
  • the recorded (and suppressed) measured variable can be used, for example, to regulate the electrode gap between the (non-melting) electrode of the TIG welding torch and the workpiece.
  • the recorded measured variable e.g. is used for quality assurance, for example to analyze the welding process carried out with welding device B or to monitor electrode wear, etc.
  • the at least one welding circuit and the at least one device circuit of the electrical device EG are arranged relative to one another in such a way that they can at least partially influence one another electromagnetically and / or that via a common ground line is an ohmic coupling. It is also important that a welding process is carried out in the at least one welding circuit of the at least one welding device, with a measured variable, in particular a welding voltage, being recorded in order to regulate or control the respective welding process. In at least one device circuit, in particular the welding circuit, at least one point in time flows a device current IEG or welding current I.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Arc Welding Control (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
EP19168536.1A 2019-04-10 2019-04-10 Procédé et arrangement de soudage à synchronisation de valeur mesurée Withdrawn EP3722039A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP19168536.1A EP3722039A1 (fr) 2019-04-10 2019-04-10 Procédé et arrangement de soudage à synchronisation de valeur mesurée
EP20716819.6A EP3953094B1 (fr) 2019-04-10 2020-04-09 Procédé et arrangement de soudage à synchronisation de valeur mesurée
JP2021559737A JP7300000B2 (ja) 2019-04-10 2020-04-09 測定値を同期させた溶接方法及び溶接装置
FIEP20716819.6T FI3953094T3 (fi) 2019-04-10 2020-04-09 Hitsausmenetelmä ja -järjestely mittausarvon synkronoinnilla
PCT/EP2020/060166 WO2020208144A1 (fr) 2019-04-10 2020-04-09 Procédé et système de soudage avec synchronisation des valeurs de mesure
US17/602,387 US20220161348A1 (en) 2019-04-10 2020-04-09 Welding method and assembly with measurement value synchronization
CN202080027587.9A CN113677472B (zh) 2019-04-10 2020-04-09 带有测量值同步的焊接方法和焊接组件

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19168536.1A EP3722039A1 (fr) 2019-04-10 2019-04-10 Procédé et arrangement de soudage à synchronisation de valeur mesurée

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EP3722039A1 true EP3722039A1 (fr) 2020-10-14

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EP20716819.6A Active EP3953094B1 (fr) 2019-04-10 2020-04-09 Procédé et arrangement de soudage à synchronisation de valeur mesurée

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US (1) US20220161348A1 (fr)
EP (2) EP3722039A1 (fr)
JP (1) JP7300000B2 (fr)
CN (1) CN113677472B (fr)
FI (1) FI3953094T3 (fr)
WO (1) WO2020208144A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322602A (en) * 1981-01-23 1982-03-30 Miller Electric Manufacturing Company Square wave power supply for arc welding
EP0787555A1 (fr) * 1996-01-31 1997-08-06 Matsushita Electric Industrial Co., Ltd. Appareil et méthode pour la gestion de la puissance fournie lors d'une opération de soudage du type soudage à l'arc pulsé avec électrode consommable
EP1268110B2 (fr) 2000-04-05 2011-06-08 Fronius International GmbH Procede de regulation et de poursuite en continu d'une position d'un chalumeau de soudage ou d'une tete de soudage
US20150343549A1 (en) * 2014-05-30 2015-12-03 Lincoln Global, Inc. Multiple electrode welding system with reduced spatter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4760053B2 (ja) * 2005-02-28 2011-08-31 パナソニック株式会社 アーク溶接装置の制御方法およびアーク溶接装置
JP4815966B2 (ja) 2005-09-21 2011-11-16 パナソニック株式会社 アーク溶接システム
AT504197B1 (de) * 2006-09-08 2010-01-15 Fronius Int Gmbh Schweissverfahren zur durchführung eines schweissprozesses
JP5596394B2 (ja) * 2010-03-31 2014-09-24 株式会社ダイヘン アーク溶接方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322602A (en) * 1981-01-23 1982-03-30 Miller Electric Manufacturing Company Square wave power supply for arc welding
EP0787555A1 (fr) * 1996-01-31 1997-08-06 Matsushita Electric Industrial Co., Ltd. Appareil et méthode pour la gestion de la puissance fournie lors d'une opération de soudage du type soudage à l'arc pulsé avec électrode consommable
EP1268110B2 (fr) 2000-04-05 2011-06-08 Fronius International GmbH Procede de regulation et de poursuite en continu d'une position d'un chalumeau de soudage ou d'une tete de soudage
US20150343549A1 (en) * 2014-05-30 2015-12-03 Lincoln Global, Inc. Multiple electrode welding system with reduced spatter

Also Published As

Publication number Publication date
EP3953094A1 (fr) 2022-02-16
CN113677472A (zh) 2021-11-19
WO2020208144A1 (fr) 2020-10-15
JP2022528714A (ja) 2022-06-15
US20220161348A1 (en) 2022-05-26
EP3953094B1 (fr) 2023-05-31
FI3953094T3 (fi) 2023-06-29
JP7300000B2 (ja) 2023-06-28
CN113677472B (zh) 2023-06-23

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